echo

实例

例子 1

输出文本：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"Hello world!"</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

亲自试一试

例子 2

把字符串变量（$str）的值写入输出：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello world!"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token variable">$str</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

亲自试一试

例子 3

把字符串变量（$str）的值写入输出，包括 HTML 标签：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello world!"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token variable">$str</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"<br>What a nice day!"</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

亲自试一试

例子 4

连接两个字符串变量：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str1</span><span class="token operator">=</span><span class="token string double-quoted-string">"Hello world!"</span><span class="token punctuation">;</span>
<span class="token variable">$str2</span><span class="token operator">=</span><span class="token string double-quoted-string">"What a nice day!"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token variable">$str1</span> <span class="token operator">.</span> <span class="token string double-quoted-string">" "</span> <span class="token operator">.</span> <span class="token variable">$str2</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span> 

亲自试一试

例子 5

把数组值写入输出：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$age</span><span class="token operator">=</span><span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Peter"</span><span class="token operator">=></span><span class="token string double-quoted-string">"35"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"Peter is "</span> <span class="token operator">.</span> <span class="token variable">$age</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'Peter'</span><span class="token punctuation">]</span> <span class="token operator">.</span> <span class="token string double-quoted-string">" years old."</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

亲自试一试

例子 6

把文本写入输出：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"This text
spans multiple
lines."</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span> 

亲自试一试

例子 7

如何使用多个参数：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'This '</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'string '</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'was '</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'made '</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'with multiple parameters.'</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span> 

亲自试一试

例子 8

单引号和双引号的区别。单引号将输出变量名称，而不是值：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$color</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"red"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"Roses are <span class="token interpolation"><span class="token variable">$color</span></span>"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'Roses are $color'</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

亲自试一试

例子 9

简化语法（只适用于 short_open_tag 配置设置启用的情况）：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$color</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"red"</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>Roses are <span class="token php language-php"><span class="token delimiter important"><?=</span><span class="token variable">$color</span><span class="token delimiter important">?></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span> 

亲自试一试